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find -iname '.htaccess' -exec sed 's/Deny from all//' -i {} \;

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RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]

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RewriteEngine on
RewriteCond %{REQUEST_URI} !/maintenance.html$
RewriteCond %{REMOTE_ADDR} !^123\.123\.123\.123
RewriteRule $ /maintenance.html [R=302,L]

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RewriteEngine On
#Replace ?mysite\.com/ with your blog url
RewriteCond %{HTTP_REFERER} !^http://(.+\.)?mysite\.com/ [NC]
RewriteCond %{HTTP_REFERER} !^$
#Replace /images/nohotlink.jpg with your "don't hotlink" image url
RewriteRule .*\.(jpe?g|gif|bmp|png)$ /images/nohotlink.jpg [L]

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<FilesMatch "(install\.sql|config\.php|config\.php\.sample)$">
    deny from all
</FilesMatch>

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ErrorDocument 400 /errors/badrequest.html
ErrorDocument 401 /errors/authreqd.html
ErrorDocument 403 /errors/forbid.html
ErrorDocument 404 /errors/notfound.html
ErrorDocument 500 /errors/serverr.html

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FileETag MTime Size
<ifmodule mod_expires.c>
  <filesmatch "\.(jpg|gif|png|css|js)$">
       ExpiresActive on
       ExpiresDefault "access plus 1 year"
   </filesmatch>
</ifmodule>

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<Limit GET POST>
    order allow,deny
    deny from 200.49.176.139
    allow from all
</Limit>

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<?php
function words_limit( $str, $num, $append_str='' ){
  $words = preg_split( '/[\s]+/', $str, -1, PREG_SPLIT_OFFSET_CAPTURE );
  if( isset($words[$num][1]) ){
    $str = substr( $str, 0, $words[$num][1] ).$append_str;
  }
  unset( $words, $num );
  return trim( $str );
}

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<?php

$url = "http://example.org/";
if (preg_match('/^(http|https|ftp):\/\/([A-Z0-9][A-Z0-9_-]*(?:\.[A-Z0-9][A-Z0-9_-]*)+):?(\d+)?\/?/i', $url)) {
    echo "Your url is ok.";
} else {
    echo "Wrong url.";
}